WASHINGTON -- President Donald Trump shared highly classified information with the Russian foreign minister and Russian ambassador to the U.S. in a White House meeting last week, according to The Washington Post.

H.R. McMaster, Trump's national security adviser who participated in the meeting, told the Post that Trump and the officials, Russian Foreign Minister Sergei Lavrov and Russian Ambassador to the US Sergey Kislyak, discussed "common threats."

"The President and the foreign minister reviewed common threats from terrorist organizations to include threats to aviation," McMaster told The Washington Post. "At no time were any intelligence sources or methods discussed and no military operations were disclosed that were not already known publicly."

According to the Post, Trump described details to Lavrov and Kislyak about how ISIS hopes to use laptop computers as bombs on planes.

"I get great intel. I have people brief me on great intel every day," one official with knowledge told the Post described Trump as saying, before the President reportedly relayed specific intelligence.

CNN has yet to confirm the details of The Washington Post report.

The White House denounced the report.

"This story is false. The president only discussed the common threats that both countries faced," said Dina Powell, deputy national security adviser for strategy, who attended the meeting.

National Security Adviser H.R. McMaster, who also participated in the meeting, downplayed the report as well.

"The president and the foreign minister reviewed common threats from terrorist organizations to include threats to aviation," McMaster said. "At no time were any intelligence sources or methods discussed and no military operations were disclosed that were not already known publicly."

In April, CNN first reported that US intelligence and law enforcement agencies believed that ISIS and other terrorist organizations had developed new ways to place explosives in laptops and other electronic devices to evade airport security screening methods. US intelligence suggested that terrorists had obtained sophisticated airport security equipment that allowed them to test how to effectively conceal explosives in electronic devices, CNN reported at the time.

That intelligence led the Trump administration to ban travelers flying out of 10 airports in eight countries in the Middle East and Africa from carrying electronic devices larger than cell phones aboard planes. The United Kingdom, which possessed the same intelligence, placed a similar prohibition on passengers flying from six countries, including two that were not on the US list.

Officials told CNN that the ban came about following the collection of intercepted material and "human intelligence."

The Department of Homeland Security is reportedly considering expanding the electronics ban to flights from Europe to the United States.

A bipartisan group of senators appeared surprised on Monday when told about The Washington Post story, and members of the Senate intelligence committee said they were not briefed on the matter.

Republican Sen. Lindsey Graham of South Carolina told reporters that the report was "troubling, if true."

Sen. Bob Corker, a Tennessee Republican, said it would be "very, very problematic" is true.

"I would say it's disturbing but I think we've got to find out more before I could comment," said Sen. John McCain, an Arizona Republican. "I just can't comment on every news story so but obviously ... it's not a good thing."

Sen. James Risch, an Idaho Republican, defended Trump on the story, telling reporters: "The minute the President speaks about it to someone, he has the ability to declassify anything at any time without any process."

Democratic Sen. Mark Warner of Virginia tweeted the Washington Post story, and added: "If true, this is a slap in the face to the intel community. Risking sources & methods is inexcusable, particularly with the Russians."

The Wednesday meeting between Trump, Lavrov and Kislyak had already raised alarm bells in Washington, primarily because it came one day after Trump decided to fire FBI Director James Comey while the bureau investigated his campaign's alleged ties to Russia.

The meeting, a personal request from Russian President Vladimir Putin, who asked that they meet when he spoke with Trump, earlier this month, was supposed to remain behind closed doors without any media coverage. But a photographer from Russian state-media Tass attended the meeting and took photos of a laughing Trump with Lavrov and Kislyak.

No US media were allowed into the meeting.

Though an angry White House official told CNN they felt "tricked" by the Russians, White House spokeswoman Sarah Huckabee Sanders said "proper protocol was followed" by not allowing media into the meeting.